scholarly journals Characterization of polylactic-epoxidized natural rubber/modified cellulosic fiber biocomposites with different silane coupling agents

2020 ◽  
Vol 773 ◽  
pp. 012009
Author(s):  
S Kadea ◽  
J Seekaew ◽  
S Thongmala ◽  
R Hedthong ◽  
N Khanoonkon ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Epoxidized Natural Rubber ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Cellulosic Fiber ◽  
Silane Coupling

COOPERATIVE EFFECTS OF EPOXIDE FUNCTIONAL GROUPS ON NATURAL RUBBER AND SILANE COUPLING AGENTS ON REINFORCING EFFICIENCY OF SILICA

2014 ◽  
Vol 87 (2) ◽  
pp. 291-310 ◽  
Author(s):  
W. Kaewsakul ◽  
K. Sahakaro ◽  
W. K. Dierkes ◽  
J. W. M. Noordermeer
Keyword(s):  
Natural Rubber ◽  
Functional Groups ◽  
Coupling Agent ◽  
Silica Content ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Cooperative Effects ◽  
Optimal Loading ◽  
Silane Coupling

ABSTRACT Polar functionality attached onto natural rubber has a significant impact on the reinforcing efficiency of silica. Parallel studies involving various levels of epoxidation on natural rubber (ENR) in the absence of bis-(triethoxysilylpropyl) tetrasulfide (TESPT) coupling agent, as well as a combination of ENRs with different loadings of TESPT, provide a better understanding of the various factors that influence the properties of silica-filled ENR compounds. Based on the overall properties, the best possible combination to optimize processability, to reduce filler–filler interaction, and improve vulcanization rate as well as vulcanizate properties, is to use ENR with an epoxide content in the range of 20–30 mol%, together with a small portion of TESPT, that is, 2–4 wt% relative to the silica content. This leads to a reduction of approximately 60–80% of TESPT when compared with the conventional NR compounds, where the optimal loading of TESPT was 9.0 wt% relative to the silica content.

The Characterization of Silicon Powder Modified by Silane Coupling Agent and its Effect

2014 ◽  
Vol 1048 ◽  
pp. 460-464
Author(s):  
Dong Dong Zhang ◽  
Shao Guo Wen ◽  
Ji Hu Wang ◽  
Peng Zhu Wang
Keyword(s):  
Silicon Powder ◽  
Polymer Materials ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Hydrophobic Property ◽  
Modification Effect ◽  
Silane Coupling ◽  
Ft Ir ◽  
The Cost

Silicon powder is a kind of important nonmetallic mineral. It not only reduce the cost of polymer materials, but also can improve the performance of materials. In order to make silicon powder play a better role, this paper shows that surface modification of silicon powder by using the silane coupling agents KH550 and KH560. Through hydrophobic property, infiltrating performance, activation index, infrared spectroscopy(FT-IR) and scanning electron microscopy (SEM).It can be find that the evaluation and characterization of silicon powder modification effect. Comprehensive analysis shows that the modification effect is best,when KH550 and KH560 is the ratio of 1:2.

Preparation of Polymer Microspheres Using Silane Coupling Agent Modified Nano-SiO2 as Single Stabilizer

2011 ◽  
Vol 341-342 ◽  
pp. 247-251 ◽  
Author(s):  
Guang Hui Ma ◽  
Fa Ai Zhang ◽  
Chang Sheng Gu
Keyword(s):  
Silica Nanoparticles ◽  
Average Particle Size ◽  
Optical Microscope ◽  
Coupling Agents ◽  
Average Particle ◽  
Silane Coupling Agents ◽  
Pickering Emulsion Polymerization ◽  
Silane Coupling ◽  
Unmodified Silica

This paper demonstrates that silica nanoparticles were modified by the four silane coupling agents (KH-151, KH-550, KH-560, KH-570) firstly, then polystyrene/silica (PS/SiO2) composite microsphere with PS core and silica nanoparticles shell were prepared by Pickering emulsion polymerization. The characterization of optical microscope (OM), scanning electron microscope (SEM), and thermogravimetic analysis ( TGA) illustrates that these microsphere are composed of PS and silica nanoparticles. Silica nanoparticles modified by the different silane coupling agents could form the stable PS/SiO2 microsphere over 70 °C, while the unmodified silica nanoparticles are difficult to form stable PS/SiO2 microspheres at the same temperature. The PS/KH-151-SiO2 microsphere exhibits the least average particle size, while the PS/KH-570-SiO2 microsphere produces the largest. Both SEM and TGA confirm that microsphere surface exists solid nanoparticles.

Effects of silane coupling agents on the vulcanization characteristics of natural rubber

2004 ◽  
Vol 94 (4) ◽  
pp. 1511-1518 ◽  
Author(s):  
Hexiang Yan ◽  
Kang Sun ◽  
Yong Zhang ◽  
Yinxi Zhang ◽  
Yongzhong Fan
Keyword(s):  
Natural Rubber ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Silane Coupling

Preparation and Characterization of TiO2 Nanowires Modified Organically with Coupling Agents

2021 ◽  
Vol 21 (9) ◽  
pp. 4870-4876
Author(s):  
Xiaohui Wang ◽  
Yan Chen ◽  
Tongtong Wang ◽  
Wenchang Zhuang ◽  
Jun Zhou
Keyword(s):  
Ph Value ◽  
Coupling Agents ◽  
Hydroxyl Number ◽  
Silane Coupling Agents ◽  
Tio2 Nanowires ◽  
One Dimensional ◽  
Surface Hydroxyl ◽  
Static Contact ◽  
Silane Coupling

Anatase-type one-dimensional TiO2 nanowire was prepared by hydrothermal method. The nanowires were modified by three kinds of silane coupling agents, such as KH550, KH560 and KH570. Flocculation was caused when the amount of modifier reached a certain level. When KH570 was used at 3.0 percent, at 80 °C, 4 h, and pH value between 9 and 10, modified nanowires had the highest 56.5 percent lipophilization degree, the lowest 0.562 per/nm2 surface hydroxyl number, and the maximal 121.2° static contact angle.

Adhesion of carbon steel and natural rubber by functionalized silane coupling agents

2017 ◽  
Vol 72 ◽  
pp. 70-74 ◽  
Author(s):  
Jing Sang ◽  
Sumio Aisawa ◽  
Katsuya Miura ◽  
Hidetoshi Hirahara ◽  
Oravec Jan ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Natural Rubber ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Silane Coupling

Influence of bis(triethoxysilylpropyl) tetrasulfide amount on the properties of silica-filled epoxidized natural rubber-based composites

2016 ◽  
Vol 23 (4) ◽  
pp. 357-362
Author(s):  
Omar A. Al-Hartomy ◽  
Ahmed A. Al-Ghamdi ◽  
Said A. Farha Al Said ◽  
Nikolay Dishovsky ◽  
Mihail Mihaylov
Keyword(s):  
Natural Rubber ◽  
Dynamic Properties ◽  
Epoxidized Natural Rubber ◽  
Rubber Matrix ◽  
Coupling Agents ◽  
Silane Coupling Agents ◽  
Rubber Composites ◽  
Rubber Compounds ◽  
Curing Characteristics ◽  
Epoxy Groups

AbstractThe aim of the present article is to investigate the influence of the amount of bis(triethoxysilylpropyl) tetrasulfide on the curing characteristics and mechanical and dynamic properties of rubber composites based on epoxidized natural rubber (Epoxyprene 50) filled with 70 phr silica. The obtained results showed that although the interaction between the epoxy groups of epoxidized natural rubber and the silanol groups of silica through hydrogen bonds improves the dispersion of filler in the rubber matrix, the presence of silane coupling agents is necessary to obtain rubber compounds and vulcanizates with good vulcanization characteristics and mechanical and dynamic properties.

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